2 files changed, 9 insertions, 0 deletions

diff --git a/src/video_core/engines/maxwell_3d.cpp b/src/video_core/engines/maxwell_3d.cpp
index b998a8e69..a0dd7400d 100644
--- a/src/video_core/engines/maxwell_3d.cpp
+++ b/src/video_core/engines/maxwell_3d.cpp
@@ -179,6 +179,13 @@ u32 Maxwell3D::GetMaxCurrentVertices() {
     return num_vertices;
 }
 
+size_t Maxwell3D::EstimateIndexBufferSize() {
+    GPUVAddr start_address = regs.index_buffer.StartAddress();
+    GPUVAddr end_address = regs.index_buffer.EndAddress();
+    return std::min<size_t>(memory_manager.GetMemoryLayoutSize(start_address),
+                            static_cast<size_t>(end_address - start_address));
+}
+
 u32 Maxwell3D::ProcessShadowRam(u32 method, u32 argument) {
     // Keep track of the register value in shadow_state when requested.
     const auto control = shadow_state.shadow_ram_control;
diff --git a/src/video_core/engines/maxwell_3d.h b/src/video_core/engines/maxwell_3d.h
index e2256594d..cfe1e4883 100644
--- a/src/video_core/engines/maxwell_3d.h
+++ b/src/video_core/engines/maxwell_3d.h
@@ -3077,6 +3077,8 @@ public:
 
     u32 GetMaxCurrentVertices();
 
+    size_t EstimateIndexBufferSize();
+
     /// Handles a write to the CLEAR_BUFFERS register.
     void ProcessClearBuffers(u32 layer_count);